To assess atmospheric wet deposition impacts, a rainfall-runoff water quality monitoring study was performed in 2-forested experimental watersheds, in Turkey. Over a 2-year period some major ions were analyzed for 62 precipitation events while stream water was sampled at 15-day intervals in 2 subsequent water years; 1999–2000 and 2000–2001. A stochastic rainfall-runoff model was developed and used to estimate the discharge and then annual flux of the solutes to receiving streams. The pH in 83 percent of the precipitation events was lower than 5.6. The watershed s atmospheric deposition flux was in the higher ranks compared to other regions in the world. Because of the varying precipitation and deposition amount between the 2 years of monitoring, hydrogen ion deposition was 4.72 kmole ha–1 in the first monitoring year, while it was 1.70 kmol ha–1 in the second one. A net outflux was observed for Na+ compared to significant accumulations of wet deposited sulfate, phosphate, nitrate, ammonium, potassium and magnesium in the watersheds.